<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <form name="fo" action="10.html" onsubmit="return a()">
        <input name="txt" type="password" id="in">
        <input type="submit">
        <button type="reset">reset</button>
    </form>
    <button onclick="c()">123</button>
</body>

</html>
<script src="12.js">    </script>